It's harder to trouble shoot per say because is is no the first thing that comes to your mind. I had once a GFCI breaker, GFCI recept and a second GFCI recept on the load side on the first recept. All is needed is one GFCI device and I place it in the most convient location in the circuit. If more then one is needed for conscience, no need to put one on the load side of another. If the customer don't know where they are all at then its gets time consuming meaning a big repair bill needlessly. Not good for a reputation.
